How to distinguish the advantages and disadvantages of compound fertilizers

There are mainly the following methods to identify the advantages and disadvantages of compound fertilizers:

First, use your eyes to see whether to use double-layer packaging, and then to see whether the bag is marked with trademark, production license number and other information, and finally to see whether there is a product certificate in the inner bag. If there is no double-layer packaging or incomplete logo, it is very likely to be fake and shoddy products. When farmers open the inner bag, they also need to carefully check whether the particles of compound fertilizer are consistent, etc., if inconsistent is also likely to be fake and shoddy products.

Second, after rubbing half a handful of compound fertilizer with hands, if there is a layer of gray-white powder on the hands and has a sense of adhesion, the fine white crystals can be seen in the particles, indicating that it is a high-quality product; if there is a layer of gray-black powder on the hands and there is no sense of adhesion, and there are no white crystals in the particles, it shows that it is a poor-quality product.

Third, there is generally no peculiar smell of compound fertilizer by nose. If there is a peculiar smell, and the odor is heavy, it can be judged to be inferior compound fertilizer. After the use of such compound fertilizer, light will cause burning seedlings, heavy will lead to the loss of crops, and toxic residue for a long time, will affect the growth of the next crop.

Fourth, the water-soluble high-quality compound fertilizer has good water solubility, and most of it can be dissolved in water, even if there is a small amount of precipitate, the precipitate is also small. On the other hand, inferior compound fertilizer is more difficult to dissolve in water, and its residue is rough and hard.

Fifth, burn a small amount of compound fertilizer on the iron sheet and burn it in an open fire. At this time, the smell of ammonia contains nitrogen and the appearance of yellow flame contains potassium. The stronger the ammonia odor, the more yellow the yellow flame, indicating that the higher the content of nitrogen and potassium, it is high-quality compound fertilizer; on the contrary, it is inferior compound fertilizer. Zhao Xia